Mathematics – Logic
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21944118k&link_type=abstract
American Astronomical Society, AAS Meeting #219, #441.18
Mathematics
Logic
Scientific paper
We present cosmological hydrodynamic simulations of galaxy formation with the new moving-mesh code AREPO, which promises higher accuracy compared with the traditional SPH technique that has been widely employed for this problem. We use the same initial conditions, set of physics and gravity solver to compare these results to the ones with well-tested SPH code GADGET-3 which enables us to cleanly test the differences in hydrodynamics. We find that AREPO leads to significantly higher star formation rates for galaxies in massive halos enabled by a more efficient cooling of the hot halo gas. Furthermore, galaxies in AREPO show more extended gaseous disks, which also feature a thinner and smoother morphology than their GADGET counterparts. Consequently, galaxies formed in AREPO have higher specific angular momentum than their SPH correspondents.
We discuss the causes of these differences which can be connected to shortcomings of the standard SPH implementation. We point out that AREPO can be readily applied to simulations of galaxy formation in a cosmological context where, for a given mass resolution, it requires similar runtimes but offers much higher accuracy than GADGET-3. Our findings also raise questions about some of the previous galaxy formation studies using traditional SPH implementations.
Hernquist Lars
Keres Dusan
Sijacki Debora
Springel Volker
Vogelsberger Mark
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